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Investments - Additional Information (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2022
USD ($)
Security
manager
Mar. 31, 2021
USD ($)
Dec. 31, 2021
USD ($)
Security
Schedule of Investments [Line Items]      
Number of outside managers managing investment portfolio | manager 3    
Accrued investment income $ 77   $ 69
Number of securities with unrealized losses greater than 10% of book value for 12 months or more | Security 187   23
Total unrealized losses for securities having losses greater than 10% of book value for 12 months or more $ 56   $ 6
Assets held-in-trust 229   243
PCD Accounting Model to PCI Securities      
Schedule of Investments [Line Items]      
Additional credit loss expense 5 $ 3  
AGL Subsidiaries      
Schedule of Investments [Line Items]      
Assets held-in-trust 1,160   1,231
Future Equity Investments      
Schedule of Investments [Line Items]      
Remaining minimum amount committed 96    
Future Equity Investments | AGL Subsidiaries | AssuredIM managed fixed-maturity securities      
Schedule of Investments [Line Items]      
Investments, authorized amount to invest 750    
Invested Capital | AGL Subsidiaries | AssuredIM managed fixed-maturity securities      
Schedule of Investments [Line Items]      
Long-term purchase commitment, amount 473    
Unfunded Commitment | AGL Subsidiaries | AssuredIM managed fixed-maturity securities      
Schedule of Investments [Line Items]      
Long-term purchase commitment, amount 229    
Equity in Earnings (Losses) of Investees | AGL Subsidiaries | AssuredIM managed fixed-maturity securities      
Schedule of Investments [Line Items]      
Long-term purchase commitment, amount 702    
Equity in Earnings (Losses) of Investees | AGAS | AssuredIM managed fixed-maturity securities      
Schedule of Investments [Line Items]      
Investments, fair value disclosure $ 559   $ 543